Phototherapy Basics Information
1. 620-630nm is the first treatment window of light on the skin
2. 605nm, 610nm and 620nm is the peak absorption of haemoglobin, so the penetration depth of 620nm --- 630nm light on the skin is basically proportional to the wavelength.
3. short wavelengths less than 480 have a tanning effect.
4. 540 and 580 is a vascular disease The light absorption spectrum of melanin is monotonically decreasing with increasing wavelength. Again, in order to avoid the side effects of <480nm and to take into account that melanin is only distributed within the epidermis, shallow penetration is required. Therefore, the lower limit of 540nm can be used to treat vascular lesions and at the same time remove the darkness very effectively. If there are no vascular lesions on the face, then choose the lower limit of 590nm, which can not only remove wrinkles and skin rejuvenation, but also remove melanin, achieving the effect of "skin rejuvenation and whitening".
6. Wrinkle skin rejuvenation is the target of photons is dermal tissue. On the one hand, it requires a certain depth of penetration. The longer the wavelength in the visible to near infrared range, the deeper the penetration. On the other hand, dermal tissue is much larger than haemoglobin, microvessels and melanin, and of course requires much more heat. The longer the wavelength, the more efficient the photothermal conversion. Therefore the lower limit of the wavelength for wrinkle rejuvenation is chosen near the lower limit of the first treatment window. When photorejuvenation is used to improve the structure of the dermis, a wavelength between 596-610nm is chosen, which overlaps with the wavelength used for hair removal. Rejuvenation of hair-free areas is not a problem, but rej